Ventilator of the louver type



NOV. 29,- 1938. LEHMKUHL; 2,138,18Q

I VENTILATOR OF THE LOUVER TYPE Filed March 1957 I 3 sheets-sheet 1 crocxkt m INVENT'IQR 1 W A T V- NOV. 29, 1938. J LEHMKQUHL I 2,138,180

VENTILATOR' OF THE LOUVER TYPE Filed March 51, 1957 3 Sheets-Sheet 2 I Jakfm Law kuhl VENT R Nov. 29, 1938. v J, L'EHMKUHL 2,138,180

VENTILA'POR OF THE LOUVER TYPE Filed March 51, 1937 5 Sheets-Sheet 3 J'OQK I m Lehmk I VENT Q.

"BM n TV Patented Nov. 29, 1938 UNITED STATES 2,138,180 V VENTILATOR OF THEIDUVEB Joakim Lehmkuhl, Oslo, Norway Application March 31, 1937, Serial No. 133,973 In Norway April 3, 1936 4 Claims. '(01. 98-101) The well known ventilators of the louver type for exhaust of air or the passing of fresh air into rooms comprise a number of pivotally mounted, above each other arranged louver plates which 5' for the opening or closing of the ventilators are caused to turn about individual axes. These louver type ventilators comprise a number of dis-' advantages, one of which is that the ventilating hole does not become entirely uncovered. Furlil thermore, the louver plates which in the open position will remain in the passage of the air have an ability of gathering dust and other particles, which at many places has caused the Board of Healthto refuse the use of such ventilators in rooms occupied by persons, for instance in kitchens and the like rooms, and finally these louver type ventilators comprise a number of sliding movements and parallel mechanisms for the operating of same, which operating means easily becomes out of order.

One object of the present invention is to provide a ventilator. of the louver type, where the above mentioned disadvantages are not present, and generally speaking the invention consists in a method of hinging the individual plates, serving tea for the closing and opening of the ventilator in such away that they during the opening 'or .0105- ing process of the ventilator will pass through movements generally corresponding to the movements of the folding doors, used for instance'on vehicles for transportation of persons.

In order to constructasuitable arrangement of this type in combination with a ventilator, and keeping in mind the construction of the least number of difierent parts and also in order to avoid sliding actuating members, due to the fact that these easily get out of order or get stuck, the ventilator according to this invention is constructed in such a way that pairs of plates are hinged together at the same time as one of each pair is hinged to the ventilator frame on the one side and to the other plate on the other side, while the latter plate is provided with a rigidly mounted rod or bar, which at'a suitable point, for instance and place itself over the former plate or aline itself with the former plate, respectively for th opening and closing of the ventilator.

When constructing a ventilator according to this invention, one may follow the method which ll will be described in this description with reference to Fig. 7 in the drawings.

As a modified embodiment of the invention one will in some cases adapt another construction, where the two plates forming one pair are not 10 rigidly hinged together, but where the plate which is hinged to the frame of the ventilator is provided with a sliding guide,'in whichthe other plate is hinged, the latter platein the same way as above described being provided with a rod or 1 bar which in this construction is directly hinged to the frame of the ventilator at a point which is positioned substantially diagonally in relation to the hinge point of the former plate to the frame in a square which has the former plate forming the two sides respectively, when it isin closed and open position. This simple mechanism is constructed in' such a way that one may actuate either the plate which is hinged to the frame or the rod which is rigidly fixed tothe other plate, swinging either one of these through an angle of 90, and this movement will cause that both plates will shift position from being placed one above theother in the open position and alined adjacent to each other in the closed position of the ventilator.

A further objectof this invention is to provide suitable actuating means for hand operation of the ventilator which may be operated directly by hand as well as indirectly by means of a string to be pulled. This actuating mechanism comprises a circular disk or sector which is adapted to actuate the plates by means of suitableconnecting rods, and which is provided with teeth or apertures which are in mesh with a pinion, 40 arranged at 90 to the said disk or sector, the said pinion being directly or indirectly provided with a two-armed lever which for example at each end is provided with astring in such a way that the ventilator may be opened and closed by a pull in one or the other of these strings or by taking hold of the two-armed lever directly by hand and by turning same in the same way as a thumb screw.

A further object of the invention is with reference to the last paragraph to arrange the said two-armed lever in such a way with reference to the pinion orthe shaft that the arms may be detached and mounted in different positions at an angle of 90 to each other in such a way that plates 3, 4, 5 and 6. The plates 3 and 6 are by Y underor upper edge of the ventilator or on one I of the sides of same.

According to the invention it is of interest, in order to feduce the width of each plate, to use two pairs of such plates to cover the opening in the ventilator. When doing this, two sets of actuating mechanisms for the-movements of the plates constituting each pair will be necessary, and according to this invention these two sets of actuating mechanisms are connected together in such a way that the movements performed by one of these sets will be automatically transmitted to the other set.

In order that the invention may be easily understood, it will in the following be described with reference to the drawings,'illustrating preferredembodiments of the invention.

In the drawings:

Fig. 1 illustrates a longitudinal section through a ventilator which is closed.

Fig. '2 illustrates a corresponding section through the same ventilator in partly. open position.

Figs. 3 and 4 illustrate corresponding figures of another embodiment of the invention.

Figs. 5 and 6 illustrate a further embodiment of the invention.

Fig. 7 illustrates diagrammatically the geometrical construction of the operating mechanism for the plates.

Fig. 8 illustrates to a larger scale a detail of the actuating mechanism for the opening and closing of the ventilator.

Fig. 9 illustrates this mechanism seen from the side and adapted to be used on a ventilator -mounted in such a way that the actuating mechanism will be placed on the lower side of same.

Fig. 10 corresponds to Fig. 9 but illustrates the position of the actuating mechanism when arranged on one of the sides of the ventilator.

In the drawings, Figs. 1, 2, 3 and 4, I represents the frame and 2 a register which possibly may be arranged in front of the ventilator, if desired. The opening of the ventilator between the two sides I of the frame is covered by means of four means of hinges I and 8 hinged to each one of the sides I of the frame. The plates 4 and 5 are by means of hinges 9 and I0 connected to each one of the plates?! and 6.

At or near that end of the: plates 4 and 5 which are opposite to the hinges 94 and I0, these plates are provided with stiff rigidly attached bars or rods II and I2 which extend from the plates normal to these and which may have substantially the same length as the width of the plates. At the other end of the bars II and I2, these are by means of hinges I3 and I4 connected to bars I5 and I6 which at the other end are hinged to pivot points I1, I8 on the frame. The length of the bars I5 and I6 may preferably correspond to the width of the plates, and the pivotpoints I1 and I8 may preferably be arranged normal to the plates in closed position and directly outside the hinges 9 and Ill and at the same distance from these as the width of each plate. The accurate position of these hinged points, however, and the dimensioning will be generally explained below with reference to Fig. '7.

. In the embodiment illustrated in Figs. 1 and 2, an actuating mechanism I9 which in the drawings is shown as a sector, is pivotally attached at 20 to the frame and is provided with an arm 2i which projects outside the frame of the ventilator. The sector I8 is provided with a roller or the like 22 which has guidingicontact in a slot or the like 23 on the inside of the plate I. The sector is furthermore provided with a hinge 24 whereto isattached a bar 25 which extends to the other end of the ventilator and which here is hinged to an arm 26 which is pivotally journalled 'at the point 21 on the frame and which is in rigid connection with another arm 28 which at its end has a roller or the like 29 which runs in a slot 30 in the plate 6.

In Fig. 1--as already mentioned above-the ventilator is illustrated in its closed position. If the ventilator is to be opened, the handle 2I is moved in the direction of the arrow 3| and the roller 22 will slide in the slot 23 and cause the plate 3 to swing about its hinge 1, whereby the hinge 9 will follow the'path of the arrow 32. During this movement, the bar I5 will swing about the point II, at a beginning in such a way that the hinge point I3 will follow the path of the arrow 33, for thereafter under further movement of the plate 3 to turn around, following the arrow 34.

In Fig. 2 the ventilator is illustrated in partly open position. From this figure it will be seen how the' diflferent parts will move, if the arm 2I is moved further on towards the left side of the drawings. Then finally the plate 3 will take a position on top of the side of the frame I, while the plate 4 will take a position on top of the plate 3. Simultaneously with the above mentioned movements of the different parts on the left side of the ventilator, these movements will by means of the rod 25 be transferred to the arm system 26, 28, and the plates 6 and 5 with corresponding rods I2 and I6 will take part in and perform the movements in a corresponding way. The ventilator is in the position illustrated in Fig. 2 opened to an extent corresponding to A. If it is desired to close the ventilator, the arm 2| is moved opposite to the direction of the arrow 3I and the individual parts will again take the position which is shown in Fig. 1.

InFigs. 3 and 4 another embodiment of the ventilator as above described with reference to Figs; 1 and 2 is shown. In the main features the two ventilators correspond to each other, and the same reference numerals will be found to a great extent on Figs. 3 and 4 which have already been used with reference to Figs. 1 and 2. The main difference between the two embodiments lies in that mechanism which is used for operating the ventilator. This comprises an actuating mechanism 35 which in the drawings is illustrated as a circle, turnably attached to the frame at 36 and provided with an arm 31 which projects out side'the frame of the ventilator. The circle plate 35 is provided with hinges 38, 39, to which bars 40, H are attached, which extend relatively to each side and are hinged to arms 42, 43, respectively on the plates 3, 6.

In Fig. 3 the ventilator is shown in its closed position. If it is desired to open the ventilator, the handle 31 is moved in the direction of the arrow 44, and the rods 40, 4I will'swing the plates 3, 6 about their hinges I and 8 at the same time I as the hinges 9 and III will follow the path of and 5 will place themselves right against the sides of the frame, while the plates 4 and 5 will place themselves over the plates 3 and 6. For the closing of the ventilator, the arm 31 is moved in the direction opposite to the arrow 44, and the different parts will again take the same position as shown in Fig. 3.

In the embodiment shown in Figs. 5 and 6, corresponding parts are marked with corresponding numerals as in Figs. 1, 2, 3 and 4. In order to simplify the description, the movements of the plates 5 and 5 only will be described in this embodiment.

The plate 6 is hinged to the frame I by means of a hinge 8 in such a way that the hinges may swing from the closed position shown in Fig. 5 according to the are 46 to an intermediate position as shown in Fig. 6, or further in such a way that the plate '8 will place itself on top of the side of the frame i. The plate 5 is provided with a bar 41 which at the point 48 is hinged to the frame i. The point 48- is arranged diagonally in relation to the hinge 8 in a square, where the plate 6 forms one side and the bar 41 the other side. On the plate 5 or the bar M the roller 49 is arranged, having guiding in a slot 50 in the plate .6. This arrangement operates in such a way that if the bar 41 is sung about the point 43, then the roller 49 will follow the are 5!, and due to the fact that this roller has guiding in the slot 50, the plate 6 will simultaneously swing about its hinge 8. While this swinging movement takes place, the point 52 on the plate 5 will move according to the are 53, and when the bar 6? has swung through an angle of 90, the point 52 will have moved substantially to the point of location of the hinge 8 in such a way that the two plates 8 and 5 will be positioned on the top of each other against the side of the frame i. The plates t and 5 will perform this movement whether the actuating mechanism is arranged in relation to the bar M or directly on the plate 3.

In order to make the two pairs of plates move simultaneously, an arm 56 with a sector 55 may be provided, to which sector bars 56 and 51 are attached, said bars being connected to the bars ll and M. The swinging movement of the sector 55 will thus cause the two pairs of plates 6, 5

and ii, 3 to be opened or closed simultaneously and correspondingly.

In Fig. 7 is illustrated how it is preferred. t go about the problem of deciding the different dimensions of the different parts of which the ventilator is constructed.

In this figure one will further find the same numerals as used in Figs. 1, 2, 3 and 4; only half of the ventilator is shown, however, illustrating two parts. In order now to locate the point i8 and the length of the bar l6, one may while taking into consideration the different dimensions of the available frame, choose thelength of the stiff bar l2 which is rigidly attached to the plate 5' substantially according to wish. If thereafter one draws the plate 5' and the bar i2 in the other extreme position, i. e. in the open position of the ventilator as shown in Fig. '7 with dotted lines, one will obtain two points l4, l4

on the constructional drawing. Between these two points, a line b is to be drawn, and in the middle of this a perpendicular a is to be raised. The pivot point l8 for the bar i6 shall now-'-- in order to obtain a correct result -be located on this line a, taking into consideration the different dimensions of the frame of the ventilator.

In Figs. 8, 9 and 10, a preferred embodiment for the actuating mechanism for the plates describedinthe foregoing description is shown.

In these figures 35 denotes a vdisk which is To this disk are On the frame of the ventilator there is further mounted a pinion Gil which is in mesh with the teeth 59 and which are journalled on the shaft 6|, suitably arranged on the frame of the ventilator. a two-armed lever 62, 53, which is attached to the pinion 60 by means of a thumb screw 64 and which is prevented from turning in relation to the pinion by means of projections 65, 66, 61, 68, which maybe arranged on the pinion or on a part directly or indirectly attached to same. The arms 82, 63 may for instance be provided with holes 63, 10, to which a string 7 I, serving to actuate the arms, may be attached.

On this shaft there is further arranged If the ventilator is mounted with the actuating mechanism in such a way that this will be positioned at the lower or upper edge of the ventilator, the arms 52, 83 must be attached to the pinion 60 as shown in Fig. 9. If, however, the ventilator is mounted in such a way that the actuating mechanism will be positioned on one of the sides of the ventilator, then it is necessary to reset the arms 62, 63 in such a way that they in spite of this turning of the frame of the ventilator itself, will take 'the position in relation to the horizontal which is shown in Figs. 9 and 10. This is done by loosening the thumb screw 64%, whereafter the arms 62, 63 may be shifted 90, which will be seen from Fig. 10.

It will be understood from the above that this actuating mechanism is very suitable and will provide for an accurate opening and closing of the ventilator by means of a pull in a string l i.

In the foregoing description the present invention has been dwcribed with reference to ventilators of the louver type, and the object of the invention is also generally speaking to provide a good construction for this purpose. rangement according to this invention may, however, also to a great extent be used for other 1 purposes of corresponding type and the special embodiment of the invention which has been de scribed in the foregoing may in special cases with advantage be used for opening and closing of doors andwindows. The present invention thus also covers. the described'mechanism used for such purposes.

I claim: cc

. 1. A ventilator comprising an open'frame of rectangular cross section adapted to be mounted inan air passage, the current of which is to be controlled, a. plurality of shutter plates hinged together in pairs and adapted to cover or uncover the said frame, one plate of each pair of plates being hinged to the said frame along one edge and to the other plate along the opposite edge, the latter plate being provided with a fixed arm extending into the said frame and being provided at its free end with a link pivotally fixed in one end of said arm and at the other end to the .frame at a point remote from the plates in their closed position.

2. A ventilator comprising an open frame of The ar- 50 rectangular cross section adapted to be mounted in an air passage, the current of which is to be controlled, a plurality of shutter plates hinged together in pairs and adapted .to cover or uncover the said frame, one plate of each pair of plates being hinged to the said frame along one edge and to the other plate along the opposite edge, a rigid arm projecting outwardly from the outer plate of each pair and being disposed at the edge of the plate, a link pivotally connected to each arm and to a pivot point on the frame, said point being located remote from the plates in their closed position.

3. A ventilator comprising an open frame ofrectangular cross section adapted to be mounted in an air passage, the current of which is to be controlled, a plurality of shutter plates hinged together inpairs and adapted to cover or uncover the said frame, one plate of each pair of plates being hinged to the said frame along one edge and to the other plate along the opposite edge, the latter plate being provided with a fixed arm extending into the said frame and being provided at its free end with a link pivotally fixed in one end of said arm and at the other end to the frame at a point remote from the plates in their closed position, an actuating mechpivotally fastened to the frame, a sliding guide on one of the said plates engaged with said last anism comprising an arm extending outside and controlled, a plurality of shutter plates hinged together in pairs and adapted to cover or uncover the said. frame, one plate of each pair of plates being hin'ged to the said frame along one edge, a sliding guide on the first mentioned plate hinged to the frame, a hinge connection for the second plate and the frame comprising a member hinged to the frame, the axis of the hinge connection being disposed relative to the meeting edges of the two plates in the closed position and at a distance from said meeting edges equal to the width of one plate.

JOAKIM :I Al: I :l 

